There's more than just the accelerating expansion of the universe that dark energy helps account for. Or alternately, there's more lines of evidence for dark energy than just Type 1a supernovae. It is an interesting paper, but I'm not qualified to judge if their assumptions are correct. It also doesn't rule out accelerating expansion, it just puts no-acceleration in the range of possibility.
Should generate some discussion among cosmologists.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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